Aegla, Leach, 1820

Marçal, Ingrid Costa, Páez, Fernanda Polli, Silva, Priscila Frazato Da, Souza-Shibatta, Lenice & Teixeira, Gustavo Monteiro, 2021, Cryptic diversity among populations of Aegla Leach, 1820 (Decapoda: Anomura: Aeglidae) from Tibagi River basin, Paraná state, Brazil, with descriptions of three new species, Journal of Natural History 55 (33 - 34), pp. 2145-2171 : 2161-2163

Aegla s antosi sp. nov. Marçal and Teixeira

( Figures 11–14 )

urn:lsid:zoobank.org:act:5751F246-51C1-4BC3-BBD5-CE21CB09CEC5

Holotype

Male [ CLE 19.3 mm], Brazil, Paraná, Telêmaco Borba, Paranapanema River basin, Tibagi River sub-basin, Codorna Branca stream, 24°15 ʹ 06.70”S, 50°31 ʹ 46.58”W, altitude 792 m, G. M. Teixeira, I.C. Marçal and P.F. da Silva coll., 11 March 2020 (MZUEL 511).

Paratypes

5 males [ CLE 13.4–20.9 mm] and 5 females [ CLE 14.1 –16.0 mm], same data as holotype (MZUEL 500) . 1 male [ CLE 17.0 mm] and 1 female [ CLE 16.9 mm], same locality, J.F.M. da Silva, E.S. da Silva and S.T. Bennemann coll., 7 August 2014 (MZUEL 470).

Additional material examined

7 males [size not recorded] and 3 females [size not recorded], same data as holotype (MZUEL 505, genetic vouchers: Bold Systems access AEGLA 005-21, AEGLA 006-21) . 1 male [ CLE 13.3 mm], Brazil, Paraná, Telêmaco Borba, Paranapanema River basin, Tibagi River sub-basin, Varanal stream, 24°19 ʹ 59.70”S, 50°33 ʹ 37.20”W, altitude 761 m, S .T . Bennemann coll., 19 May 2005 (MZUEL 183). 3 males [ CLE 12.7–16.8 mm], same locality and coll ., March 2004 (MZUEL 349). 1 male [ CLE 20.5 mm], same locality and coll ., 24°20 ʹ 12.70”S, 50°32 ʹ 03.20”W, altitude 802 m, 11 February 2005 (MZUEL 332). 1 male [ CLE 16.4 mm], same locality and coll ., 24°20 ʹ 13.40”S, 50°35 ʹ 23.10”W, altitude 687 m, 9 November 2005 (MZUEL 344). 1 female [ CLE 17.0 mm], Brazil, Paraná, Telêmaco Borba, Paranapanema River basin, Tibagi River sub-basin, Harmonia stream, coordinates and coll . unknown, 20 June 2006 (MZUEL 414). 4 females [ CLE 12.5–15.8 mm], same locality, coordinates and coll . unknown, 16 March 2012 (MZUEL 415). 1 male [ CLE 15.2 mm] and 1 female [ CLE 15.4 mm], Brazil, Paraná, Telêmaco Borba, Paranapanema River basin, Tibagi River sub-basin, Moinho Velho stream, 24°13 ʹ 18.34”S, 50° 37 ʹ 42.42”W, altitude 739 m, S .T . Bennemann coll., 7 August 2014 (MZUEL 426). 1 male [ CLE 25.3 mm], same locality, J .F .M. da Silva coll., 3 November 2014 (MZUEL 427). 2 females [ CLE 14.4 –15.0 mm], Brazil, Paraná, Telêmaco Borba, Paranapanema River basin, Tibagi River subbasin, Colônia stream, 24°10 ʹ 27.79”S, 50°37 ʹ 28.45”W, altitude 736 m, S .T . Bennemann coll., 7 August 2014 (MZUEL 437).

Diagnosis

Rostrum triangular, narrow base, extending beyond distal apex of compound eyes, carinate along entire length. Subrostral process well developed, occupying proximal third of subrostral margin, anterior and posterior margins forming obtuse angle. Orbital and extra-orbital sinuses deep. Anterolateral spines reaching basal margin of cornea. Epigastric prominences pronounced. Protogastric lobes pronounced. Areola trapezoidal. Cardiac area subrectangular. Epibranchial area slightly elongated. Lobe on proximal dorsal margin of dactylus rudimentary or absent. Carpal ridge high on outer surface of carpus. Ventromesial border of cheliped ischium with 4 or 5 tubercles. Ventral angles of third and fourth abdominal epimeron with corneous scales apically. Uropods wide.

Figures

Figure 11. Aegla santosi sp. nov., male holotype, CLE 19.3 mm, Codorna Branca stream, Telêmaco Borba, Paraná, Brazil (MZUEL 511). (a) dorsal view of the cephalothorax and anterior portion of the abdomen. (b) ventral view of ischium of minor cheliped (left) showing four tubercles (arrow). (c) third thoracic sternite truncate (arrow). (d) dorsal view of second abdominal epimeron (right side) showing anterolateral angle with corneous scale (white arrow) and anterior margin slightly concave (black arrow). Scale bars: a = 5.0 mm; b–d = 1.0 mm.

Figure 12. Aegla santosi sp. nov., male holotype, CLE 19.3 mm (MZUEL 511). (a) external surface view of the anterior portion of the cephalothorax showing pronounced protogastric lobes (white arrow) and well-developed subrostral process (black arrow). (b) dorsal view of the anterior region of the cephalothorax showing anterolateral spine reaching basal margin of the cornea (black arrow) and slightly elongated epibranchial area (white arrow). Scale bars: a = 1.0 mm; b = 5.0 mm.

Figure 13. Aegla santosi sp. nov., male holotype, CLE 19.3 mm (MZUEL 511). (a) dorsal view of the dactylus, propodus and carpus of major cheliped (right) showing disciform palmar crest (thick arrow) and high carpal ridge (thin arrow). (b) ventral view of ischium of major cheliped (right) with four tubercles (arrows). (c) dorsal view of the dactylus, propodus and carpus of minor cheliped (left) showing disciform palmar crest (thick arrow) and high carpal ridge (thin arrow). (d) ventral view of ischium of minor cheliped (left) with four tubercles (arrows). Scale bars: a, c = 5.0 mm; b, d = 1.0 mm.

Figure 14. Aegla santosi sp. nov., male holotype, CLE 19.3 mm (MZUEL 511). (a) third (thin arrow) and fourth (thick arrow) thoracic sternites. (b) dorsal view of second abdominal epimeron (right side) showing slightly concave anterior margin (thick arrow) and anterolateral angle with corneous scales (thin arrow). Scale bars = 1.0 mm.