Caste formation in the termite genus Termopsis
Caste formation in the termite genus Termopsis
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DOI：
10.1002/jmor.1050430206
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发表时间：
1927-03-01
影响因子：
--
通讯作者：
Heath, H
中科院分区：
文献类型：
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作者：
Heath, H
在Termopsis nevadensis只有士兵在第一个3-4年生产。当一个正常的群体由大约20个居民组成时，第一个成年士兵可能是在第五龄;第二个，稍微大一点，肯定是在第六龄。后来，其他人在第七区出生，在生殖种姓分化后，大约有450名居民，他们在第八区。最后，在非常古老的社区，至少有一些是在第九层。有翅昆虫总是排在第八位。在生殖等级出现之前，没有翅膀的迹象，在生殖等级出现之后，每一个第六龄的成员，可能是第五龄的成员，都有小而独特的翅膀雏形。这些持续和扩大在后期阶段的生殖种姓，而且，较小的规模，他们经常发生在士兵若虫和在较小程度上在成人。第三种形态的成虫可能是性成熟的兵若虫;第二种形态的成虫似乎有相同的起源，虽然拥有翅芽，但它不属于一个特殊的种姓。最近孵化的年轻人的分数的测量披露没有差异以外的普通的变化，无论是在头部的宽度，触角节的数量，或大脑和性腺的大小。种姓分化的第一个明显迹象出现在相对较晚的阶段。对各龄期进行了详细的描述，并对以后的龄期进行了比较。
In Termopsis nevadensis only soldiers are produced during the first 3-4 years. When a normal colony comprises approximately 20 inhabitants, the first adult soldier is probably in the 5th instar; the 2nd, somewhat larger, certainly is in the 6th. Later, others are produced in the 7th, and after the reproductive caste becomes differentiated, with about 450 inhabitants, they are in the 8th. Finally, in very old communities, some, at least, are in the 9th. The winged insect invariably is in the 8th. No sign of wings exists until the reproductive caste appears, after which every member of the 6th, and probably the 5th, instar possesses small, yet distinct, wing rudiments. These persist and enlarge in the later stages of the reproductive caste, and, of smaller size, they frequently occur in the soldier nymph and to a less degree in the adult. The third-form adult is probably a sexually mature soldier nymph; the second-form adult seemingly has the same origin and, though possessing wing buds, it does not belong to a special caste. Measurements of scores of recently hatched young disclose no differences other than those of ordinary variation, either in width of head, number of antennal segments, or size of brain and gonad. The first visible signs of caste differentiation appear at a relatively late stage. All of the instars are described in detail and the later ones are compared.