A new species of the troglobitic genus <i>Spelaeogammarus</i> da Silva Brum, 1975 (Amphipoda: Artesiidae) from a cave in the Brazilian semi-arid region, with new records of its congener, <i>Spelaeogammarus spinilacertus</i> Koenemann and Holsinger, 2000

Bueno, Alessandra Angélica de Pádua; Bichuette, Maria Elina; Zepon, Tamires; Penoni, Ludmila Rocha

doi:10.1590/2358-2936e2022020

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Original Article • Nauplius 30 • 2022 • https://doi.org/10.1590/2358-2936e2022020 copy

A new species of the troglobitic genus Spelaeogammarus da Silva Brum, 1975 (Amphipoda: Artesiidae) from a cave in the Brazilian semi-arid region, with new records of its congener, Spelaeogammarus spinilacertus Koenemann and Holsinger, 2000

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Abstract

We propose a new species of the troglobitic genus Spelaeogammarus da Silva Brum, 1975, with data on its distribution, ecology, aspects of behavior, and conservation status. Spelaeogammarus ginae sp. nov. occurs in a single cave in the Serra do Ramalho karst area, of the northeastern Brazilian semi-arid region. We also provide new data on the distribution and conservation status of its congener, Spelaeogammarus spinilacertus Koenemann and Holsinger, 2000 that occurs in the upper phreatic aquifer inside caves from Chapada Diamantina domain. Both species occur in caves in the state of Bahia, northeastern Brazil.

Keywords:
Amphipoda; conservation; state of Bahia; subterranean; taxonomy

Morphological characteristic	S. ginae sp. nov.	S. bahiensis	S. sanctus	S. santanensis	S. spinilacertus	S. titan	S. trajanoae	S. uai
A1 length in relation to body length	<0.5	—	0,4	0.4-0.5	0.5	~0.5	—	~0.5
A1 flagellum number of articles	18-20	16	22	20-21	17-20	26	—	17-20
A1 accessory flagellum number of articles	5	3-4	5	5	4	6	—	5
A2 flagellum number of articles	8-10	7	10	8-10	7	10	—	7-8
M1 outer plate number of multi-cuspidate setae	7-8	7	7	7	6-7	6	—	7
M1 palp article 2 number of apical setae	6-7	0	~7	—	5-6	~7	—	4
G1 basis posterior margin number of setae	14-18	7-9	15-17	20	6-8	20	9-10	15
G2 basis posterior margin number of setae	14-18	0	20	21-23	9-10	23	8-9	18
P5 basis posterior margin number of setae	12-14	—	0	12	10-11	~20	10-12	8
P7 basis posterior margin number of setae	6-8	—	~9	—	7-9	~11	10	~9
Pleopod 1 inner ramus distal margin number of plumose setae	9-10	—	11	—	—	10	—	9
Pleopod 2 inner ramus distal margin number of plumose setae	10-11	—	12	—	—	11	—	9
Pleopod 3 inner ramus distal margin number of plumose setae	10	—	10	—	—	13	—	9
U1 outer ramus number of setae on outer margin	0	0	0	—	0	7	—	0
U1 outer ramus number of setae on inner margin	1-3	2	3	—	3	21	—	5
U2 outer ramus number of setae on outer margin	0	—	1	—	2-3	3	—	1
U2 outer ramus number of setae on inner margin	2	—	2	—	0	2	—	2
U3 outer ramus number of setae on outer margin	11-13 cuspidate with accessory seta	—	15	—	12-18	12	4-18	18 cuspidate with accessory seta
U3 outer ramus number of setae on inner margin	0-1 simple + 8-19 bifid long + 3-7 cuspidate with accessory seta	—	21 bifid long + 4 cuspidate with accessory seta	—	~20 bifid	21 simple	—	16 bifid + 5 cuspidate with accessory seta

Sociedade Brasileira de Carcinologia Instituto de Biociências, UNESP, Campus Botucatu, Rua Professor Doutor Antônio Celso Wagner Zanin, 250 , Botucatu, SP, 18618-689 - Botucatu - SP - Brazil
E-mail: editor.nauplius@gmail.com

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[1] CORRESPONDING AUTHOR
Alessandra Angélica de Pádua Bueno alebueno@ufla.br, aapbueno@yahoo.com.br