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GENUS CRYPTOHAUSTORIUS GEN. NOV. Zoobank registration: urn:lsid:zoobank.org:act: 34DE5F4A-3CA2-4F80-AFFE-5287A77AE1D1. Type species: Cryptohaustorius triarticulatus (Robertson & Shelton, 1980), comb. nov. Diagnosis: Small haustoriids (2–5 mm). Maxilla 2 outer lobe broadly expanded, roughly twice size of inner lobe. Pleon continuous with urosome; epimeron 3 smooth, ventrally curved (without hook). Telson cleft to base, strongly spinated. Etymology: From Greek κρύΠτω, hidden or concealed, and Latin haustorius the type genus of the family, from Latin haustor, ‘something that draws in’. The gender is masculine. Known species: Cryptohaustorius triarticulatus (undescribed species complex; Hancock et al., 2019). Range: Restricted to the Gulf of Mexico. Most numerous in brackish bays, sometimes subtidally on open coasts. Additional taxonomic issues may exist. For example, we found that the genus Protohaustorius appears to be polyphyletic, with Pr. deichmanne Bousfield, 1965 grouping within the Parahaustorius clade. However, without additional members of the genus and with low confidence of the phylogenetic position of Pr. bousfieldi Robertson & Shelton, 1978, we suggest that additional data is needed before taxonomic reorganization is warranted.

GENUS HAUSTORIUS MÜLLER, 1775 Type species: Haustorius arenarius Slabber, 1769. Diagnosis: Large haustoriids (5–16 mm). Maxilla 2 outer lobe narrow and lanceolate, more than twice size of inner lobe. Pleon overhanging urosome; epimeron 3 smooth, ventrally curved (without hook). Telson cleft emarginate. Known species: Haustorius algeriensis Mulot, 1968; H. arenarius Slabber, 1769; H. canadensis Bousfield, 1962; H. mexicanus Ortiz et al., 2001 *; H. orientalis Belan-Santini, 2005. *The status of H. mexicanus is unclear. If a true Haustorius (in our definition above), it would represent the only Haustorius in the GoM. However, we have been unable to obtain specimens of this species and have not located it at its type locality. Range: Restricted to open coasts in the Atlantic and Mediterranean., Published as part of Hancock, Zachary B., Ogawa, Hiroshi, Light, Jessica E. & Wicksten, Mary K., 2022, Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira, pp. 1252-1267 in Zoological Journal of the Linnean Society 194 (4) on pages 1263-1264, DOI: 10.1093/zoolinnean/zlab023, http://zenodo.org/record/6458300, {"references":["Muller PLS. 1775. Des Ritters Carl von Linne koniglich Schwedischen Leibarztes ... vollstandiges Natursystem nach der zwolften lateinischen Ausgabe und nach Anleitung des hollandischen Houttuynischen Werks mit einer ausfuhrlichen Erklarung. Sechster Theil. Von den Wurmern. Erster Band. Nebst neunzehn Kupfertafeln. Nurnberg: G. N. Kaspe.","Slabber M. 1769. Natuurkundige verlustigingen, behelzende microscopise waarneemingen van de in- en uitlandse wateren land-dieren. Haarlem: J. Bosch.","Bousfield EL. 1962. New haustoriid amphipods from the Canadian Atlantic region. Bulletin of the National Museum of Canada 183: 63 - 75.","Ortiz M, Chazaro-Olvera S, Winfield I. 2001. A new amphipod crustacean of the genus Haustorius (Gammaridea, Haustoriidae), from the east coast of Mexico. Avicennia 14: 53 - 59."]}

GENUS LEPIDACTYLUS SAY, 1818 Type species: Lepidactylus dysticus Say, 1818. Diagnosis: Small- to medium-sized haustoriids (2–7 mm). Maxilla 2 outer lobe narrow, lanceolate (except in L. allardi), roughly twice size of inner lobe. Maxilliped baler lobe weakly developed. Pleon slightly overhanging urosome; epimeron 3 smooth, ventrally curved (without hook). Telson cleft emarginate or to base. Known species: Lepidactylus allardi Hancock & Wicksten, 2018; L. dysticus Say 1818; L. galvezi Hancock & Wicksten, 2018; L. jayneae Foster & LeCroy, 1991. Range: Gulf of Mexico and Atlantic coastlines. Open coasts, brackish bays.

Additional file 1.