In addition, the smooth and glossy 4th
abdominal segment (second gastral segment) of B.
The relationship between the length of the propodus of the first cheliped or the length of the pleuron of the second
abdominal segment and body size (CL) of shrimps was examined using the allometric model y = [ax.sup.b] (Hartnoll, 1978, 1982).
fountaineae is coloured sky-blue without a hint of green, the same colour as the blue that occurs on the eighth
abdominal segment (Dijkstra and Lewington 2006).
Abdominal segments less rugose, with a continuous fine medial carina.
3D, E, F): Strikingly protruding, the exerted part (measured diagonally) nearly as long as
abdominal segment VII, with general facies of a triangular bill with rounded apex.
This segment is separated from the subsequent
abdominal segments by a thin septum that was present in the larva (Fig.
Abdominal segment 8 black; a long brown-red transverse bar on posterior margin.
Chaetotaxia on
abdominal segments. Organ Long, Short, siender setae spine-like setae
Abdominal segment I Prescutum 4 2 Subscutum Absent Absent Scutum 8 16 Scutellum 10 10
Abdominal segment II Prescutum 4 16 Subscutum 1 3 Scutum 10 35 Scutellum 7 28
Abdominal segment III Prescutum 4 22 Subscutum 1 3 Scutum 8 44 Scutellum 8 31
Abdominal segment IV Prescutum 24 4 Subscutum 1 3 Scutum 8 39 Scutellum 10 33
Abdominal segment V Prescutum 4 25 Subscutum 1 3 Scutum 19 40 Scutellum 10 34
Abdominal segment VI Prescutum 4 33 Subscutum 1 3 Scutum 19 28 Scutellum 10 15
Abdominal segment VII (2 row).
Antennae very long and filiform, reaching to
abdominal segment III in females and longer than body in males.
1A); antennal segment IV longer than 1.00; hemelytral membrane in the macropterous form almost reaching apex of last
abdominal segment, in brachypterous form reaching posterior border of
abdominal segment III or anterior border of IV; femora not granulate, sparsely clothed with semidecumbent, silvery, bristle-like setae; maximum width of abdomen wider than 4.60.
Mature larvae of Nearctic Rhantus have been described as having cerci (urogomphi) that are as long as or longer than the last (eighth)
abdominal segment (5,6).