Peripatidae#Neopatida

The Peripatidae exhibit a range of derivative features. They are longer, on average, than the Peripatopsidae and also have more leg pairs. The number of legs in the Peripatidae varies within species as well as among species{{Cite journal |last=Monge-Nájera |first=Julián |date=1994 |title=Reproductive trends, habitat type and body characteristcs in velvet worms (Onychophora) |url=https://revistas.ucr.ac.cr/index.php/rbt/article/view/23266 |journal=Revista de Biología Tropical |volume=42 |issue=3 |language=en |pages=611–622 |issn=2215-2075}} and ranges from 19 pairs (in Typhloperipatus williamsoni{{Cite journal|last=Kemp|first=Stanley|date=1914|title=Onychophora|url=https://www.biodiversitylibrary.org/page/11128933#page/637/mode/1up|journal=Records of the Indian Museum|volume=8|pages=471–492|doi=10.5962/bhl.part.1194 |s2cid=88237018 |via=Biodiversity Heritage Library|doi-access=free}}) to 43 pairs (in Plicatoperipatus jamaicensis{{Cite journal|last1=Yang|first1=Jie|last2=Ortega-Hernández|first2=Javier|last3=Gerber|first3=Sylvain|last4=Butterfield|first4=Nicholas J.|last5=Hou|first5=Jin-bo|last6=Lan|first6=Tian|last7=Zhang|first7=Xi-guang|date=2015-07-14|title=A superarmored lobopodian from the Cambrian of China and early disparity in the evolution of Onychophora|url=https://www.researchgate.net/publication/279385005|journal=Proceedings of the National Academy of Sciences|language=en|volume=112|issue=28|pages=8678–8683|doi=10.1073/pnas.1505596112|issn=0027-8424|pmid=26124122|pmc=4507230 |bibcode=2015PNAS..112.8678Y |via=ResearchGate|doi-access=free }}).{{Cite book|last1=Giribet|first1=Gonzalo|url=https://www.degruyter.com/document/doi/10.1515/9780691197067-032/html|title=30. Onychophora|last2=Edgecombe|first2=Gregory D.|date=2020-03-03|publisher=Princeton University Press|isbn=978-0-691-19706-7|language=en|doi=10.1515/9780691197067-032|s2cid=240645062 }}{{Cite journal|last=Mayer|first=Georg|date=2007-04-05|title=Metaperipatus inae sp. nov. (Onychophora: Peripatopsidae) from Chile with a novel ovarian type and dermal insemination|url=https://www.researchgate.net/publication/216267921|journal=Zootaxa|volume=1440|issue=1|pages=21–37|doi=10.11646/zootaxa.1440.1.2|issn=1175-5334|via=ResearchGate}} The gonopore is always between the penultimate leg pair. There are no known oviparous species—the overwhelming majority, including all the Neotropical Peripatidae, are viviparous with females that develop a placenta to provide the growing embryo with nutrients. The Asian genera Typhloperipatus and Eoperipatus, however, exhibit lecithotrophic ovoviviparity; that is, their females do not develop any placenta and instead retain yolky eggs in their uteri to supply nourishment.{{Citation |last1=Mayer |first1=Georg |title=Onychophora |date=2015 |url=https://doi.org/10.1007/978-3-7091-1865-8_4 |work=Evolutionary Developmental Biology of Invertebrates 3: Ecdysozoa I: Non-Tetraconata |pages=53–98 |editor-last=Wanninger |editor-first=Andreas |place=Vienna |publisher=Springer |language=en |doi=10.1007/978-3-7091-1865-8_4 |isbn=978-3-7091-1865-8 |access-date=2023-02-15 |last2=Franke |first2=Franziska Anni |last3=Treffkorn |first3=Sandra |last4=Gross |first4=Vladimir |last5=de Sena Oliveira |first5=Ivo|url-access=subscription }}

The Peripatidae, also known as equatorial velvet worms,{{Cite web |title=Equatorial Velvet Worms (Family Peripatidae) |url=https://www.inaturalist.org/taxa/85980-Peripatidae |access-date=2023-03-07 |website=iNaturalist |language=en}} are restricted to the tropical and subtropical zones; in particular, they inhabit Central America, the Caribbean, northern South America, Gabon, Northeast India, and Southeast Asia.{{cite journal|last1=Oliveira|first1=I. S.|last2=Read|first2=V. M. S. J.|last3=Mayer|first3=G.|title=A world checklist of Onychophora (velvet worms), with notes on nomenclature and status of names|journal=ZooKeys|date=2012|issue=211|pages=1–70|doi=10.3897/zookeys.211.3463|pmid=22930648|pmc=3426840|doi-access=free|bibcode=2012ZooK..211....1O }}

Neopatida is a monophyletic lineage within the Peripatidae, comprising all peripatids except the few found outside of the Americas.{{Cite journal |last1=Costa |first1=Cristiano Sampaio |last2=Giribet |first2=Gonzalo |date=2021-05-25 |title=Panamanian velvet worms in the genus Epiperipatus, with notes on their taxonomy and distribution and the description of a new species (Onychophora, Peripatidae)|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/ivb.12336 |journal=Invertebrate Biology |volume=140 |issue=3 |doi=10.1111/ivb.12336 |s2cid=236359517 |issn=1077-8306|url-access=subscription }} The excluded peripatid genera are the southeast Asian {{Extinct}}Cretoperipatus and Eoperipatus, the African Mesoperipatus, and the northeast Indian Typhloperipatus.

The family consists of the following genera:

• {{Extinct}}Cretoperipatus Engel & Grimaldi, 2002
• Eoperipatus Evans, 1901
• Mesoperipatus Evans, 1901
• Typhloperipatus Kemp, 1913
• Neopatida

:* Cerradopatus Oliveira et al., 2015

:* Epiperipatus Clark, 1913

:* Heteroperipatus Zilch, 1954

:* Macroperipatus Clark, 1913

:* Mongeperipatus Barquero-González et al., 2020{{Cite journal|last=Barquero-González, Sánchez-Vargas, Morera|date=2020|title=A new giant velvet worm from Costa Rica suggests absence of the genus Peripatus (Onychophora: Peripatidae) in Central America|journal=Revista de Biología Tropical|volume=68|pages=300–320|doi=10.15517/rbt.v68i1.37675|s2cid=212697088|doi-access=free|hdl=11056/20248|hdl-access=free}}

:* Oroperipatus Cockerell, 1908

:* Peripatus Guilding, 1826

:* Plicatoperipatus (Grabham & Cockerell, 1892)

:* Principapillatus Oliveira et al., 2013

:* Speleoperipatus Peck, 1975

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