Schendylops ramirezi

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Schendylops ramirezi
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Myriapoda
Class: Chilopoda
Order: Geophilomorpha
Family: Schendylidae
Genus: Schendylops
Species:
S. ramirezi
Binomial name
Schendylops ramirezi
Pereira, 2013

Schendylops ramirezi is a species of soil centipede in the family Schendylidae. [1] [2] This centipede is notable as the species with the fewest legs recorded in the order Geophilomorpha for each sex (27 pairs of legs for males, 29 leg pairs for females). [3] This species is also the smallest in the genus Schendylops , reaching only 7 mm (0.28 in) in length. [3]

Contents

Discovery

This species was first described in 2013 by the zoologist Luis Alberto Pereira of the Universidad Nacional de La Plata based on specimens collected in 1999 in Brazil. These specimens include a female holotype, five paratypes (three males and two females), and nineteen other specimens (fifteen females and four males), including five subadults and fourteen juveniles. The species is named for the arachnologist Martin Javier Ramirez of the Museo Argentino de Ciencias Naturales in Buenos Aires, who collected all the specimens. These specimens are deposited at the Museu de Zoologia da Universidade de São Paulo. [3]

Description

This species exhibits sexual dimorphism in leg number: All seven male specimens have only 27 leg pairs, and all eighteen female specimens have only 29 pairs. The holotype female (preserved in alcohol) has a pale yellowish color and measures 7 mm (0.28 in) in length and 0.37 mm (0.015 in) in maximum body width. The two female paratypes range from 6.5 to 7 mm (0.26 to 0.28 in) in length, whereas the three male paratypes range from 5 to 6 mm (0.20 to 0.24 in) in length. The five subadults (two females and three males) measure 4.5 mm (0.18 in) in length and the fourteen juveniles (thirteen females and one male) range from 3 to 4 mm (0.12 to 0.16 in) in length. Given the small size of these tiny centipedes, the original description refers to S. ramirezi as a "dwarf species." [3]

Only one species of soil centipede other than S. ramirezi, is known to include centipedes with only 27 pairs of legs: Schendylops oligopus . [3] Males of the species S. oligopus have 27 or 29 leg pairs, whereas females of this species have 31 pairs. These males, however, usually have 29 leg pairs and rarely have only 27 pairs. In a large sample of 31 males, only one specimen had only 27 leg pairs. [4]

Furthermore, only one species of soil centipede other than S. ramirez is known to include females with only 29 leg pairs: Dinogeophilus oligopodus , with 29 leg pairs in both sexes. Thus, only S. ramirezi features the minimum number of legs recorded in the order Geophilomorpha for males as well as for females. [3] Only six species in the order Geophilomorpha, including S. ramirezi, S. oligopus, and D. oligopodus, are known to feature centipedes with only 29 leg pairs. [5]

The species S. ramirezi shares a distinctive set of traits with several other species of Schendylops, including S. oligopus. These features include pore-fields limited to the anterior region of the body, but without a pore-field on the sternite of the first leg-bearing segment. Moreover, the fourth segment of the antenna is similar in length to the contiguous segments. [3] [6]

Although S. ramirez and S. oligopus share many features, including a similar number of legs, these two species also differ from one another in numerous respects. For example, whereas S. ramirezi features setae on the coxosternite of the first maxillae and a large seta in the middle of the coxosternite of the second maxillae, all these setae are absent in S. oligopus. Furthermore, while both species are small, S. oligopus is nevertheless larger than S. ramirezi: Females of the species S. oligopus can reach 10 mm in length, and males can reach 8 mm in length. [3]

Distribution

This species is known only from the type locality (Ilha Grande) in Rio de Janeiro State in Brazil. [3]

Related Research Articles

<span class="mw-page-title-main">Geophilidae</span> Family of centipedes

The Geophilidae are a polyphyletic, cosmopolitan family of soil centipedes in the superfamily Geophiloidea containing the mostly defunct clades Aphilodontidae, Dignathodontidae, Linotaeniidae, Chilenophilinae, and Macronicophilidae. These centipedes are found almost worldwide.

<span class="mw-page-title-main">Himantariidae</span> Family of centipedes

Himantariidae is a monophyletic family of centipedes in the order Geophilomorpha and superfamily Himantarioidea, found almost exclusively in the Northern Hemisphere. Centipedes in this family feature a short head with a concave labral margin bearing a row of denticles, a single dentate lamella and some pectinate lamellae on each mandible, second maxillae with strongly tapering telopodites and slightly spatulate claws, and a stout forcipular segment with short forcipules and a wide tergite; the ultimate legs usually have no pretarsus, and the female gonopods are distinct and biarticulate.

<span class="mw-page-title-main">Mecistocephalidae</span> Family of centipedes

Mecistocephalidae is a monophyletic family of centipedes in the order Geophilomorpha. It is the only family in the suborder Placodesmata. Most species in this family live in tropical or subtropical regions, but some occur in temperate regions. This family is the third most diverse in the order Geophiliomorpha, with about 170 species, including about 130 species in the genus Mecistocephalus.

<span class="mw-page-title-main">Schendylidae</span> Family of centipedes

Schendylidae is a family of centipedes in the order Geophilomorpha found in the Americas, the Palearctic region, Africa, Madagascar, Australia, and southeast Asia, and also on some Pacific islands.

<i>Tygarrup</i> Genus of Mecistocephalidae centipedes

Tygarrup is a genus of centipedes in the family Mecistocephalidae, found mainly in southeast Asia and from the Seychelles to Hawaii. Although species in this genus can have either 43 or 45 leg-bearing segments, most of these species have 45 leg pairs. An undescribed Tygarrup species found in the Andaman Islands has 43 leg pairs. Centipedes in this genus are sometimes melanised in patches, and sternal glands are present the males of most species. These centipedes range from 2 cm to 6 cm in length. Tygarrup javanicus is one of the smallest of the mecistocephalid species and has become an invasive in greenhouses in Europe.

<span class="mw-page-title-main">Ballophilidae</span>

Ballophilidae is a monophyletic group of centipedes belonging to the order Geophilomorpha and superfamily Himantarioidea. Authorities now dismiss this group as a family, citing phylogenetic analysis, and instead refer to this clade as Ballophilinae, a possible subfamily within the family Schendylidae. Centipedes in this clade differ from others in the family Schendylidae by having bodies tapered toward the anterior tip, short heads, slender forcipules that are well apart, and an undivided lamina for the female gonopods. Centipedes in this clade are found in most tropical regions.

<i>Ballophilus</i> Genus of centipedes

Ballophilus is the largest genus of centipedes in the clade Ballophilidae. Species in this genus are found in tropical and subtropical regions, mainly in Africa and southeast Asia.

Sepedonophilus is a genus of three species of centipedes in the family Geophilidae. This genus is endemic to Australia, and was first described by Austrian myriapodologist Carl Attems in 1909. Centipedes in this genus feature scattered coxal pores and have no sternal pores; the lateral parts of the labrum almost touch medially, and the intermediate part is inconspicuous; the coxosternite of the second maxillae have peculiar anterior projections. These centipedes range from about 2 cm to 5 cm in length and have 49 to 79 pairs of legs. The smallest species in this genus, Sepedonophilus hodites, measures only 18 mm in length and has only 49 leg pairs, the minimum number recorded in this genus, whereas the largest species, S. perforatus, measures 50 mm in length and has 79 leg pairs, the maximum number recorded in this genus.

Queenslandophilus is a genus of centipedes in the family Geophilidae. It was described by German myriapodologist Karl Wilhelm Verhoeff in 1925. Centipedes in this genus feature second maxillae with sclerotized ridges on the coxosternite, no sternal pores, and coxopleura many scattered pores; the lateral parts of the labrum almost touch medially, and the ultimate legs most often have claws. These centipedes range from 1 cm to 6 cm in length, have 37 to 75 pairs of legs, and are found in Australia, Japan, and North America. The Japanese species Queenslandophilus monoporus and Q. macropalpus are notable for their small sizes, measuring only 10 mm and 15 mm in length, respectively. The species Q. elongatus, found in California, is notable for its large size, ranging from 40 mm to 63 mm in length. The species Q. macropalpus has only 37 leg pairs, the minimum number recorded in this genus, whereas Q. elongatus has 73 to 75 leg pairs, the maximum number recorded in this genus.

<i>Ribautia</i> Genus of centipedes

Ribautia is a genus of centipedes in the family Geophilidae. This genus was described by French myriapodologist Henry Wilfred Brolemann in 1909. Centipedes in this genus are found in South America, tropical Africa, Madagascar, the Arabian peninsula, Australia, New Zealand, and Melanesia.

Australoschendyla albanyensis is a species of centipede in the Schendylidae family. It is endemic to Australia, and was first described in 1996 by R. E. Jones.

Schendyla is a genus of centipedes in the family Schendylidae found in the west Palearctic region. This genus was described by Danish entomologists Vilhelm Bergsøe and Frederik Vilhelm August Meinert in 1866. Centipedes in this genus feature only a few spines on the claws of the second maxillae, two pores on each coxopleuron, and ultimate legs without claws or with only rudimentary claws.

Maoriella is a genus of centipedes in the family Geophilidae. It was described by Austrian myriapodologist Carl Attems in 1903. Species in this genus are found in New Zealand, Australia, and Tahiti.

Plesioschendyla is a monotypic genus of centipedes in the family Schendylidae. It is endemic to New Caledonia, a French overseas territory in Melanesia. Its sole species is Plesioschendyla confossa. It was described by French entomologist Henri Ribaut in 1923.

Pectiniunguis is a genus of centipedes in the family Schendylidae. This genus was described by American naturalist Charles Harvey Bollman in 1889. Centipedes in this genus feature second maxillae with claws fringed by two rows of filaments, transversally elliptical sternal pore-fields on almost all trunk segments, two pores on each coxopleuron, and ultimate legs without claws.

Ityphilus is a genus of centipedes in the clade Ballophilidae. It was described by American myriapodologist Orator Fuller Cook in 1899. Centipedes in this genus feature distinctly club-like antennae, well marked sclerotized lines on the forcipular coxosternite, and two pores on each coxopleuron. These centipedes range from about 1 cm to about 9 cm in length and have 41 to 113 pairs of legs. The dwarf species Ityphilus donatellae ranges from 8.5 to 11 mm in length and can have as few as 41 leg pairs, the minimum number found in this genus. The large species I. grandis can reach 93 mm in length and have as many as 113 leg pairs, the maximum number found in the clade Ballophilidae.

Marsikomerus is a genus of centipedes in the family Schendylidae. It was described by Austrian myriapodologist Carl Attems in 1938. Species in this genus are found in Mexico and in the United States.

Schendylops is the largest genus of centipedes in the family Schendylidae, containing more than 60 species. This genus was first proposed by the American biologist Orator F. Cook in 1899 for the type species originally named Schendyla grandidieri in 1897. Most species in this genus are found in the Neotropical region, but a dozen species are found in Africa and Madagascar. These species live in diverse habitats, ranging from sea level to high altitudes.

Dinogeophilus is a genus of soil centipedes in the family Schendylidae. This genus contains only two species, Dinogeophilus pauropus and D. oligopodus, which range from 4.5 to 5.5 mm in length. These species are notable as the smallest not only in the order Geophilomorpha but also among all epimorphic centipedes. The species D. oligopodus is also notable as one of only six species of soil centipedes to feature only 29 pairs of legs and one of only two species to include females with only 29 pairs, the minimum number recorded for females in the order Geophilomorpha.

Schendyla antici is a species of soil centipede in the family Schendylidae. This species is notable as one of only six species in the order Geophilomorpha to feature centipedes with only 29 pairs of legs, which is also the minimum number recorded in the genus Schendyla. No other species in this genus has so few legs.

References

  1. "ITIS - Report: Schendylops ramirezi". www.itis.gov. Retrieved 2024-06-08.
  2. Bonato, L.; Chagas Junior, A.; Edgecombe, G.D.; Lewis, J.G.E.; Minelli, A.; Pereira, L.A.; Shelley, R.M.; Stoev, P.; Zapparoli, M. (2016). "Schendylops ramirezi Pereira, 2013". ChiloBase 2.0 - A World Catalogue of Centipedes (Chilopoda). Retrieved 2024-06-08.
  3. 1 2 3 4 5 6 7 8 9 Pereira, Luis Alberto (2013-01-01). "Discovery of a second geophilomorph species (Myriapoda: Chilopoda) having twenty-seven leg-bearing segments, the lowest number recorded up to the present in the centipede order Geophilomorpha". Papéis Avulsos de Zoologia. 53 (13): 163–185. doi: 10.1590/S0031-10492013001300001 . hdl: 11336/3449 . ISSN   1807-0205.
  4. Minelli, A.; Foddai, D.; Pereira, L. A.; Lewis, J. G. E. (2000). "The evolution of segmentation of centipede trunk and appendages". Journal of Zoological Systematics and Evolutionary Research. 38 (2): 103–117. doi:10.1046/j.1439-0469.2000.382137.x. ISSN   0947-5745.
  5. Stojanović, Dalibor Z.; Šević, Mirko; Makarov, Slobodan E. (2024-03-07). "A new dwarf schendylid centipede (Chilopoda: Geophilomorpha: Schendylidae) with a low number of legs from Serbia, Balkan Peninsula". Zootaxa. 5419 (3): 401–418. doi:10.11646/zootaxa.5419.3.5. ISSN   1175-5334. PMID   38480317.
  6. Bonato, Lucio; Edgecombe, Gregory; Lewis, John; Minelli, Alessandro; Pereira, Luis; Shelley, Rowland; Zapparoli, Marzio (2010-11-18). "A common terminology for the external anatomy of centipedes (Chilopoda)". ZooKeys (69): 17–51. Bibcode:2010ZooK...69...17B. doi: 10.3897/zookeys.69.737 . ISSN   1313-2970. PMC   3088443 . PMID   21594038.