Two new species of sand-burrowing amphipods of the genus Haustorius Müller, 1775 (Amphipoda: Haustoriidae) from the northwestern Gulf of Mexico Author Hancock, Zachary B. Author Wicksten, Mary K. text Zootaxa 2018 2018-08-14 4459 1 101 127 journal article 29034 10.11646/zootaxa.4459.1.4 08b39b2c-80d7-4294-b5fc-c53d42b27030 1175-5326 1458410 3542FB98-12B4-4754-BEB6-F80EE3C82819 Haustorius jayneae Foster & LeCroy, 1991 Haustorius jayneae , Foster & LeCroy, 1991 : 259 –270, figs. 1–4. Haustorius new species , Saloman & Naughton, 1977: 359– 352. Haustorius species, Saloman & Naughton, 1977: 67–68. Diagnosis. Antenna 1, flagellum with 9 articles, accessory flagellum with 4–5 articles; antenna 2 with 10 articles; mandible incisor bifid, with 8–10 accessory blades; mandibular palp, article 3 with 17 spines in comb row; maxilla 2, outer plate lunate, narrowing distally to a slight point; maxilliped, outer plate broad, anterior angle obtuse with toothlike spines on 1/4 length of oral margin; coxa 1 deeper than wide; pereopod 3 article 5 posterior lobe greater than 1.2x length of anterior margin; pereopod 6, article 4 posterior margin distinctly rounded distally with 4 large spines; pereopod 7, article 5 subrectangular with proximal and distal margins parallel, posterior margin 1/2 length of anterior, with spines 1/2 length of distal margin; uropod 1, peduncle with 1–3 proximal spines, 2–3 interramal spines, 1–3 distal setae; telson without posterodistally produced region, posterior margin relatively flat, acutely cleft. Range. Carrabelle Beach, Florida to Mississippi Sound. Remarks . Sweet (1996) identified two new haustorius-like species west of the Mississippi River in Pass Christian, MS, Dauphin Island, AL, and Carrabelle Beach, FL. However, we located only Lepidactylus triarticulatus at Pass Christian and H. jayneae at the latter locations. This represents a range extension for H. jayneae southward from Cape San Blas, its original southern range, to at least Carrabelle Beach, where it was found in considerable numbers.