Open Access
Research Article

Table 2

A comparison of morphometric and meristic features of males of Brachiella species.

Parameter Species
B. malayensis n. sp. B. thynni B. elegans B. quaternia B. seriolae
Angle between cephalosome and trunk Right angle In line In line Right angle In line
Cephalosome length (CL) [mm] 0.56 0.89 0.60 0.57? 0.51
Trunk length (TL) [mm] 1.03 1.14 0.67 Highly reduced 0.51
Total length [mm] 1.59 2.03 1.27 0.57 1.02
TL–CL ratio 1.84 1.28 1.12 1.00
Ventroposterior processes Present Present Absent? Absent? Absent?
Dorsoventral processes (caudal rami) Fusiform Fusiform Fusiform Elongate, cylindrical Fusiform
Antennulary segmentation 4 4 4 ? 4
No. of elements on antennary endopod tip 3 3 4 4 3
Anteriormost seta on maxillulary palp Developed Developed Reduced Reduced Reduced
Proximal process of maxillipedal corpus Large Large Small Small Large
Fraction of imMXPs denticulate patch to segment size > 1/2 > 1/2 ca. 1/6 ca. 1/4 ca. 1/5
Attachment of male to female ventroposterior processes ? Yes Yes Yes Yes
Reference Present study [25, 54, 65] [16, 65] [16, 21, 66], [16]

The measurements for B. thynni were based on Wilson [64]; measurements for B. elegans, B. quaternia, and B. seriolae were based on figures or measurement of Ho and Do [16]; imMXPs = inner margin of maxilliped subchela.

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